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Questions  

If the external resistance is equal to the internal resistance of a cell of emfE .  The potential difference across its terminal is

a
E2
b
E
c
2E
d
Zero

detailed solution

Correct option is A

External resistance(R) = Internal resistance (r)                              V=E−ir                                   =E−VRR                                   =E−V                             2V=E                          ∴  V=E2

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